24
Fluoride Ion Selective Electrode User Guide
Single Known Addition Setup
1. Prepare the electrode as described in the
Electrode
Preparation
section.
2. Connect the electrode to the meter.
3. Prepare a standard solution that will cause the fl uoride
concentration of the sample to double when added to the
sample solution. Refer to
Table 3
for guidelines.
4. Determine the electrode slope by performing the procedure
in the
Checking Electrode Operation (Slope)
section.
5. Rinse the electrode with deionized water.
Table 3 Guideline For Known Addition
Volume of Addition
Concentration of Standard
1 mL
100 times sample concentration
5 mL
20 times sample concentration
10 mL*
10 times sample concentration
* Most convenient volume to use
